function vmclean(){
docker-machine ls|grep -i error|awk '{print $1}'|grep -v -i name|tr -s '\n' ' '|xargs docker-machine rm -f
}
function vmclean(){
docker-machine ls|grep -i error|awk '{print $1}'|grep -v -i name|tr -s '\n' ' '|xargs docker-machine rm -f
}